Wiktionary(0.00 / 0 votes)Rate this definition:

A set of sizes for screw threads agreed upon and jointly used by the United States Army and Navy.

Origin: From the preposition an/on.

Webster Dictionary(0.00 / 0 votes)Rate this definition:

An

this word is properly an adjective, but is commonly called the indefinite article. It is used before nouns of the singular number only, and signifies one, or any, but somewhat less emphatically. In such expressions as "twice an hour," "once an age," a shilling an ounce (see 2d A, 2), it has a distributive force, and is equivalent to each, every

An

if; -- a word used by old English authors

Origin: [Shortened fr. and, OE. an., and, sometimes and if, in introducing conditional clauses, like Icel. enda if, the same word as and. Prob. and was originally pleonastic before the conditional clause.]

Freebase(4.00 / 1 vote)Rate this definition:

an

.an is the Internet country code top-level domain for the former Netherlands Antilles. It is administered by the University of the Netherlands Antilles. As the Netherlands Antilles have been dissolved in 2010, the domain is being phased out. As of November 2010 the .an domain remains live with over 800 domains registered under .an including secondary levels.

Chambers 20th Century Dictionary(0.00 / 0 votes)Rate this definition:

An

an, adj. one: the indefinite article, used before words beginning with the sound of a vowel. [A.S. ān. See One.]